Donald C Lorents

Author:

Donald C. Lorents

ISBN #:

0444869980

US Patent:

40877655, May 2, 1978

Filed:

Jun 8, 1976

Appl. No.:

5/693851

Inventors:

Stephen A. Edelstein - Palo Alto CA
Donald C. Lorents - Palo Alto CA
Michael V. McCusker - Los Altos CA
Thomas F. Gallagher - Palo Alto CA

Assignee:

Stanford Research Institute - Menlo Park CA

International Classification:

H01S 300

US Classification:

331 945G

Abstract:

Organic transfer laser method and means are disclosed employing a gas mixture which includes an acceptor gas comprising an organic molecular vapor, and a donor gas comprising a noble gas or a group II B transition metal, such as mercury, in the vapor state. The donor gas atoms are excited to high energy metastable and/or excimer states by electron beam excitation or electron beam initiated-sustainer discharge type exciting means. Collisional transfer of electronic excitation from the excited donor gas to the lasing organic molecules takes place for excitation of organic molecules to excited singlet states in sufficient number to establish a population inversion in the electronic energy levels thereof for lasing. Depending upon the mixture employed, the laser is tunable over the visible and ultraviolet regions of the electromagnetic spectrum. Operation at high peak power levels with high efficiency is possible.

US Patent:

52344754, Aug 10, 1993

Filed:

Aug 14, 1991

Appl. No.:

7/745035

Inventors:

Ripudaman Malhotra - San Carlos CA
Donald C. Lorents - Palo Alto CA
Young K. Bae - Fremont CA

Assignee:

SRI International - Menlo Park CA

International Classification:

C10L 100
C10L 110

US Classification:

44282

Abstract:

A hydrocarbon fuel is provided with one or more fullerene additives such as, for example, C60, C70, C74, C76, C78, C82, and C84 fullerenes, to serve as an identifying means for the fuel. The particular fullerene additive or additives may varying from the fullerene additive or additives in other fuels both by type as well as by amount or concentration present in the fuel. Thus, for example, if 7 different fullerenes are used in combinations of 1, 2, or 3 fullerenes, and in 5 different concentration amounts, there exists a possibility of as many as 4,935 different combinations of fuels which may all be separately identified by the presence of such combinations of fullerenes therein.

US Patent:

55477488, Aug 20, 1996

Filed:

Jan 14, 1994

Appl. No.:

8/182283

Inventors:

Rodney S. Ruoff - Menlo Park CA
Donald C. Lorents - Palo Alto CA
Ripudaman Malhotra - San Carlos CA
Mark J. Dyer - San Jose CA

Assignee:

SRI International - Menlo Park CA

International Classification:

B32B 516

US Classification:

428323

Abstract:

Encapsulation of metals inside multilayered polyhedral shells of carbon (nanoencapsulates) is described. Many materials, such as metals and metal-carbides, can be encapsulated by the method of present invention, including metals such as lanthanides, transition metals, actinides and alloys. Some of these nanoencapsulate materials exhibit ferromagnetic and paramagnetic properties and have uses in the biomedical field as well as in recording media and composite materials.

US Patent:

53043669, Apr 19, 1994

Filed:

Dec 24, 1991

Appl. No.:

7/814721

Inventors:

Donald C. Lorents - Palo Alto CA
Ripudaman Malhotra - San Carlos CA

Assignee:

SRI International - Menlo Park CA

International Classification:

C01B 3102
C09C 144

US Classification:

423445B

Abstract:

A process and apparatus is described for the production of purified fullerenes using a non-reactive gas to collect and transport impure fullerenes from an evaporation zone to a heated filter zone in which solid impurities may be filtered out of the mixture. If one or more condensed fullerenes are present in the gas stream entering the filter zone, such condensed fullerenes may be vaporized in the filter zone and carried to a condensation zone in which one or more vaporized fullerenes may be recovered. When more than one vaporized fullerene is present in the gas entering either the filter zone or the condensation zone, a temperature gradient may be used to permit separation and recovery of purified portions of different fullerenes.

US Patent:

42583349, Mar 24, 1981

Filed:

May 17, 1976

Appl. No.:

5/686698

Inventors:

Michael V. McCusker - Los Altos CA
Donald C. Lorents - Palo Alto CA
Robert M. Hill - Palo Alto CA
Davis L. Huestis - Menlo Park CA

Assignee:

SRI International - Menlo Park CA

International Classification:

H01S 3223

US Classification:

331 945G

Abstract:

Halogen transfer laser method and means are disclosed employing a dilute mixture of molecular halogen vapor in high pressure noble gas. Noble gas atoms and molecules are excited by use of electrons to high energy metastable and/or excimer states. Collisional and/or radiative transfer of electronic excitation from the excited noble gas atoms and molecules to the lasing halogen molecules takes place for excitation of halogen molecules to upper ionic states in sufficient number to establish a population inversion in the electronic energy levels thereof for lasing. In addition to halogens, halogen-bearing compounds which dissociate and appropriately recombine to provide diatomic halogen for lasing also may be used. The laser is tunable over an electromagnetic energy range which includes ultraviolet radiation. Operation at high peak power levels with high efficiency is possible.